<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <table border="1" style="text-align: center ;border-collapse: collapse;width: 200px;margin: 0 auto">
        <thead>
            <th>第一列</th>
            <th>第二列</th>
            <th>第三列</th>
        </thead>
        <tbody style="font-size: 20px;">

            <tr>
                <td>1</td>
                <td>2</td>
                <td>3</td>
            </tr>

            <tr>
                <td>1</td>
                <td>2</td>
                <td>3</td>
            </tr>
            <tr>
                <td>1</td>
                <td>2</td>
                <td>3</td>
            </tr>

        </tbody>

    </table>
</body>

</html>